"He's an amazing guy," Jepsen, 26, gushed to Us Weekly about her boyfriend of one year, Jordi Ashworth, an architecture student. "Jordi is studying to become an architect, but right now he's taking some time out to come along and be involved in this adventure with me. It's nice that I don't get lonely," the singer previously explained Sunday World. "He blushes when he hears the song ("Call Me Maybe"), but I write a song a week, so he has a couple of CDs worth of songs dedicated to him."

But on Aug. 18, it was musician Matthew Koma proudly watching from backstage as the pop singer performed at the Summer MixTape Festival in Hershey, Penn.

What happened to Ashworth? "Carly broke up with Jordi in June because her schedule got crazy," says a source. Jepsen's career exploded after Justin Bieber, 18, shared a music video of himself with pals Selena Gomez and Ashley Tisdale dancing to her song in February of this year.

Earlier this month, Jepsen joked with Us about setting her romantic sights on a much-beloved a-list hunk. "Ryan Gosling can call me anyways!"

She recently opened up about what she's looking for in a guy. "I really like guys who have confidence, but not the cocky over-the-top confidence," she revealed. "Guys with the right type of confidence are really sexy. I love to go on spontaneous dates and do things that we've never tried before or stay at home and make a homemade dinner."